What I think the fat bug inspector dude finds in the next episode finds... [SPOILER]

He discovers Violet's rotting corpse, hence the fact she wasn't anywhere to be seen in this Wednesday's episode and according to the AHS wikia, "Violet can control the ghosts in the house. Tate says that she has this ability now, since she has 'evolved'", also that she hasn't been to school in two weeks. In other words, she's a ghost!

EDIT: Called it!